In this study, recovery of copper from solid material (obtained by leaching of chalcopyrite with oxalic acid in the presence of hydrogen peroxide) with a copper oxalate structure was carried out selectively using HCl. The chemical composition of the solid was as 29.3%, 9.7%, and 13.3% for Cu, Fe, and S, respectively. Selective recovery of copper by degrading the copper oxalate structure with a low-solubility product (Ksp = 4.43 × 10 −10 ) was performed by conventional leaching in the presence of HCl. The optimum leaching conditions were determined as 5 M of HCl concentration, 318 K of leaching temperature, 120 min of leaching time, 25 ml/g of liquid–solid ratio and 400 rpm of stirring speed. Under these conditions, approximately 77% of copper and 3% of iron were taken into the solution. According to the characterization of the leach residue that was obtained, the oxalate structure was degraded. Moreover, the results of XRD analysis showed that the sulfur (S) and cubanite (CuFe 2 S 3 ) phases were mostly observed in leaching residues, and this was supported by the SEM-EDX data. Based on the results, it may be stated that selective copper extraction can be obtained from a chalcopyrite concentrate by a two-step leaching method using a conventional hydrometallurgical technique.

中文翻译：

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用盐酸从草酸铜材料中浸出选择性回收铜

在这项研究中，从具有草酸铜结构的固体材料（通过在过氧化氢存在下用草酸浸出黄铜矿获得）中回收铜是选择性地使用 HCl 进行的。固体的化学成分分别为 Cu、Fe 和 S 的 29.3%、9.7% 和 13.3%。通过在 HCl 存在下通过常规浸出进行具有低溶解度产物 (Ksp = 4.43 × 10 -10 ) 的草酸铜结构的降解来选择性回收铜。最佳浸出条件为 5 M HCl 浓度、318 K 浸出温度、120 分钟浸出时间、25 ml/g 液固比和 400 rpm 搅拌速度。在这些条件下，大约 77% 的铜和 3% 的铁被带入溶液中。根据得到的浸出残渣的表征，草酸盐结构被降解。此外，XRD 分析结果表明，在浸出渣中主要观察到硫 (S) 和立方晶石 (CuFe 2 S 3 ) 相，这得到了 SEM-EDX 数据的支持。基于这些结果，可以说可以使用常规湿法冶金技术通过两步浸出法从黄铜矿精矿中选择性提取铜。